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Loan Servicing - Narrative (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Transfers and Servicing of Financial Assets [Abstract] |  |  |
Serviced sold mortgage loans | $ 1,371,000 | $ 1,330,000 | $ 1,276,000
Serviced sold mortgage loans with recourse | 3,000 | 4,100 | 5,400
Mortgage loans sold with recourse, reserve | $ 270 | $ 300 |
Mortgage servicing rights, discount rate | 13.00% | 13.00% |
Servicing fees included in other service income | $ 3,500 | $ 3,400 | $ 3,400
Minimum |  |  |
Transfers and Servicing of Financial Assets [Abstract] |  |  |
Mortgage servicing rights, constant prepayment speeds | 6.50% | 6.20% |
Maximum |  |  |
Transfers and Servicing of Financial Assets [Abstract] |  |  |
Mortgage servicing rights, constant prepayment speeds | 17.10% | 16.80% |
Mortgages [Member] |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |
Servicing Asset at Amortized Cost, Fair Value | $ 9,692 | $ 9,299 |

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- Definition Principal Amount Outstanding On Sold Loans Servicing Retained + References No definition available. + Details
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- Definition Principal Amount Outstanding On Sold Loans Servicing Retained With Recourse + References No definition available. + Details
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- Definition Estimated rate of prepayment of principal on financial assets for initial fair value measurement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=82924980&loc=d3e107207-111719 + Details
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- Definition Fair value of contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122739-111746 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7516967&loc=d3e66267-113978 + Details
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- Definition Discount rate used to estimate the fair value of servicing assets and servicing liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=68078379&loc=d3e122596-111746 + Details
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- Definition Amount of revenue from servicing real estate mortgages, credit cards, and other financial assets held by others. Includes premiums received in lieu of regular servicing fees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13 (d)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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